// 设置点击事件，点击时显示的部分
function show02(){
    document.getElementById("nav-home").style.display="block";
    document.getElementById("nav-profile").style.display="none";
    document.getElementById("nav-contact").style.display="none";
    };
    function show03(){
    document.getElementById("nav-home").style.display="none";
    document.getElementById("nav-profile").style.display="block";
    document.getElementById("nav-contact").style.display="none";
    };
    function show04(){
    document.getElementById("nav-home").style.display="none";
    document.getElementById("nav-profile").style.display="none";
    document.getElementById("nav-contact").style.display="block";
    };